Does i3MK3S+ require more negative values in 1st layer calibration?  

RE: Does i3MK3S+ require more negative values in 1st layer calibration?

I seem to remember reading a post saying it was normal for the superpinda to be lower, but I can't seem to find it at this point.

RE: Does i3MK3S+ require more negative values in 1st layer calibration?

It just means you should adjust the Super PINDA. If you had the old PINDA before and upgraded to the Super PINDA, they have different sensitivities, which translates to different heights. In fact, every time you futz with the extruder, you'll more likely than not have to adjust at least your Live Z, and sometimes all it takes is changing a nozzle. But when you get past -2, I would definitely readjust the PINDA. Follow the instructions in the Prusa knowledgebase (under extruder assembly), or download a helper tool such as this: https://www.prusaprinters.org/prints/57192-spinda-height-adjustment-tool-mounts-into-3030-ext

RE: Does i3MK3S+ require more negative values in 1st layer calibration?

@clarmrrsn

For the old PINDA the distance between nozzle and PINDA was supposed to be somewhere around 0.8 to 1 mm, for the Super PINDA it's more like 1.5.

RE: Does i3MK3S+ require more negative values in 1st layer calibration?

When I set up my kit last week the directions stated that if the value was greater than -2.0 to raise the Super PINDA (which will result in a lower offset value).

Ted

RE: Does i3MK3S+ require more negative values in 1st layer calibration?

Is the Super PINDA you guys/girls received straight from end to end? 

RE: Does i3MK3S+ require more negative values in 1st layer calibration?

Yes.  It could.  

RE: Does i3MK3S+ require more negative values in 1st layer calibration?

Posted by: @prusanewuser

Is the Super PINDA you guys/girls received straight from end to end? 

correct, when you do MBL, the main role the PINDA has scanning the electromagnetic fields. When you set the first layer drift you let know pinda and FW the drift (pinda does not know what difference you mead between uit an the tip of the nozzle)  between the MBL and the best nozzle position for first layer print. 

Raising the Pinda you adjust (reduce) the the necessary drift. Ideal would be 0 (zero), but this never happens 😉 not mentioning, that for plain and textured sheet you need different drif anyway.

RE: Does i3MK3S+ require more negative values in 1st layer calibration?

@zoltan

Not only do textured and smooth sheets need different Live Z (textured sheets are thinner so need more negative Live Z). Even if you have only one kind of sheet but more than one, each one will likely require a different Live Z because of small manufacturing differences in height. That’s why the menu option to store Live Z for different sheets is so super useful.

RE: Does i3MK3S+ require more negative values in 1st layer calibration?

@fuchsr

Much obliged

So it is normally much lower a Z value with a SuperPINDA vs a PINDA, not that I will ever have a PINDA Probe, but always good to know.

RE: Does i3MK3S+ require more negative values in 1st layer calibration?

@clarmrrsn

I think that’s right even though I’m still struggling trying to keep it straight what moving the sensor up or down does 😬

The SPINDA is more sensitive, so if in the same position as the PINDA it will trigger sooner, thus keeping the nozzle farther away from the sheet and therefore requiring more negative Live Z.

RE: Does i3MK3S+ require more negative values in 1st layer calibration?

BTW, I found these labels very useful, to remind me to switch stored Live Z. I have them on all my sheets.

https://www.prusaprinters.org/prints/38515-build-plate-reset-reminder

RE: Does i3MK3S+ require more negative values in 1st layer calibration?

@fuchsr

Good idea

Although I have only ordered the smooth PEI sheet to start with, will probably order a textured from Prusa with some spares when I start to print with other materials.

ATM I want to concentrate on PLA, until I gat a far better grasp of things.

Although I have learnt an awful lot already there is still so much to learn.

Learning continues when DHL arrive with my MK3 today 😀 😀 

RE: Does i3MK3S+ require more negative values in 1st layer calibration?

@fuchsr

Could it be depending on the machine even with the same model? At least for the i3MK3S, usually it works fine even I just swap the sheets without doing Z calibration. 

RE: Does i3MK3S+ require more negative values in 1st layer calibration?

Prusa suggested Zip tie. Isn't it thin? I could not get Z ~ -1.x using it. Can any of you get that range using Zip tie? I got Z ~ 2.x only. Sometimes it also failed in XYZ Calibration. Most likely because my SPINDA is bent. 

RE: Does i3MK3S+ require more negative values in 1st layer calibration?

The height difference between two sheets of the same kind may well be small enough to not require a change to Live z. It may not be perfect but good enough. Switching between smooth and textured though is less likely to work with the same live Z. I’m not sure but I think mine are about .6mm difference. 

RE: Does i3MK3S+ require more negative values in 1st layer calibration?

@prusanewuser

Most zip ties are 0.8 mm, not enough for spinda that requires 1.5mm

RE: Does i3MK3S+ require more negative values in 1st layer calibration?

@prusanewuser

And if your SPINDA is bent that’s not good. If it came like that, I’d ask Prusa Support via chat for a replacement. 

RE: Does i3MK3S+ require more negative values in 1st layer calibration?

@fuchsr

On i3MK3S, I switched between smooth and textured sheets without doing re-calibration. 

I don't know how my SPINDA is bent out of the box. Did all of you receive the upgrade kit in a typical Prusa cartoon box as shown in the first two photos: 

Prusa Knowledge Base | 1. Introduction (prusa3d.com)

Mine is just a blank old brown box with a small label stating that it is an upgrade kit. It is like they ran out of carton box and just put everything in any box they found and put a label on it.

RE: Does i3MK3S+ require more negative values in 1st layer calibration?

Posted by: @fuchsr

@prusanewuser

Most zip ties are 0.8 mm, not enough for spinda that requires 1.5mm

I used a zip tie which came with the upgrade kit. I don't know why they suggested using it.